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Gen III Flex fuel Write-up

Old 01-26-2017, 03:31 AM
  #81  
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Originally Posted by subeone View Post
Ev6 is what you need
Hi thanks for that I had been sort of guessing that was the one, I think EV6 fit bosch injectors to... should be easy to find :-D
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Old 01-31-2017, 11:21 AM
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in for updates. I plan on getting my 411 flex fuel up and running this spring.
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Old 03-13-2017, 09:59 AM
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I got my p59 flex fuel setup running. Everything is working including ac, had to do a 12volt pull up for the tach, as well. What are you guys using for flex fuel timing? The stock tables have a alot of spark retard, should we be using spark retard in the lower cells as well?
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Old 03-14-2017, 01:07 AM
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depends on the setup

for example

4.8 24 # e85 on base HO table, running 8 degrees and am adding 8 degrees via the flex fuel spark table. this is sbe, heads and all.

my 5.3 10.5:1 cr fbody on 20 # e85 running 9 on base HO table, and 10 on the flex fuel table

when i mean running 8 or 9 degrees i mean at MBT, anywhere before, and after the timing is higher.
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Old 03-14-2017, 04:15 PM
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I'm assuming you are talking about the WOT areas of cylinder airmass, those are easier for me to tune. I'm more curious about the areas in the lower mass cells such as Idle and cruising. I see all oem, and some tuned setups retarding timing in these lower no boost areas in the flex spark tables.
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Old 03-14-2017, 11:08 PM
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correct, WOT.

Part throttle i add about 6 degrees more than i would on 93. usually see mid 30s in timing in part throttle, once converter locks up and rpm go down, i see high 20s. this is on e85 on a standardish cr, and dcr, say 10:1.

dont even use the factory FF tables for anything, they retard timing in some parts due to other timing modifiers such as PE, IAT, ECT, cat lightoff etc
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Old 03-20-2017, 01:53 PM
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Just an FYI, those straight fuel fittings do not work well on an Fbody as it will move it very close to the brake master. I don't like the angle of the stock fuel feed line so I am going to make a new one. Using Redhorse Performance since they make E85 capable lines and fittings that don't require as many adapters as Russell to mate to the stock quick disconnects.

I ended up swapping my 98 to a 411 PCM since it has the flex spark table. Only issue there is that it can't run with the 98 fuel gauge so you will have to add a separate gauge.
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Old 03-21-2017, 08:54 PM
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I ended up swapping my 98 to a 411 PCM since it has the flex spark table. Only issue there is that it can't run with the 98 fuel gauge so you will have to add a separate gauge.
Hmmm....I dont think that is correct. If you go in and invert the values for the gauge, it "should" work. I have a 98 Trans am running the P59 and I found a thread someplace with the values. Fuel gauge works fine.

These are my values for gauge output:
%
0-------10----20----30-----40----50-----60----70-----80----90------100
110----99---84.9--73.77---64--54.86--45.7 -35.9 --24.9--11.31--(-11.99)


Give it a shot. If Im wrong, my advice is worth every bit you paid for it
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Old 03-22-2017, 03:04 PM
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I can't remember if I already did that or not but I will check it. I'm using the 12216125 OS instead of the 12212156 so there is no fuel segment I can swap which is where I believe the issue lies.
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Old 03-24-2017, 09:49 PM
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I'm looking for the correct pin location for a flex fuel set up on a E40 ecm from a 2005 C6 Corvette. I've found someone stating it possibly pin 56 but not sure. I'm trying to put together my own kit instead of paying a high price for one, any help would be appreciated.

Last edited by brandon619; 03-24-2017 at 10:23 PM.
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Old 03-25-2017, 09:04 AM
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*edit* highest connector pin 4 not the lowest. I must have been holding it upside down.

pin four on the "lowest" connector on my 2006 tbss
I figured it out by watching this Facebook link
this shows how to wire in flexfuel for the E40

Edit.. Not sure if the link to the Facebook video works

Last edited by i420tom; 04-21-2017 at 10:37 AM.
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Old 03-25-2017, 10:40 AM
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Originally Posted by i420tom View Post
pin four on the "lowest" connector on my 2006 tbss
I figured it out by watching this Facebook link
https://www.facebook.com/TheGarageIs...4695203661220/ this shows how to wire in flexfuel for the E40

Edit.. Not sure if the link to the Facebook video works
Thank you, the link works for me.
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Old 04-19-2017, 04:11 PM
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Got my setup running













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Old 04-20-2017, 10:31 PM
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Originally Posted by subeone View Post
been very busy with holidays at my shop sorry for you guys who have pm'd me.

Virtual FLEX FUEL has NOTHING to do with this thread. VFF uses density readings, as well as o2 feedback to predict the alcohol content on your fuel after each "refill". So whenever you turn your vehicle off, refuel with e85, and the o2s detect a lean condition as well as a density difference in the liquid, the alcohol % starts to increase until the algorithm accomplishes an acceptable stft,ltft quantum.

YES, p59 works on 98s with a repin. Works with 99-07, no 06+ doesnt have Virtual flex fuel. GTO p59s, avalnches, and express vans all have compatible PCMS. You can do a segment swap for a 60e if you have an express van file, you can do a segment swap for the fuel gauge for 98s as well.

YES, this works for 98-02 C5 vettes, i keep getting asked this question on PM's to the point where my inbox got full. I figured this out on a 98 c5 so yes it works, dont pm me asking me "are you suuuuuuuure? pinky promise it works?"

sorry to be so blunt, but all the info is in this exact thread. If you need TUNING related help, ill gladly help, but flex fuel conversion help, everything is here.
What I would need to do to run a blue/greem pcm with my 99-02 f body stock harness. Would I need to repin it for all my factory gauges to work? I really appreciate your help. Been tryin to figure this out before I jump into it.
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Old 04-20-2017, 10:49 PM
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Install p59, have tuner set it up, youre done

No harness modifications needed
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Old 04-20-2017, 11:11 PM
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Originally Posted by subeone View Post
Install p59, have tuner set it up, youre done

No harness modifications needed
This pretty much sums it up!

Make sure to grab a p59 from a cable throttle vehicle (van, 4.3, etc.)

Tach most likely needs a pull up resistor (Google it).

I've only had luck with flex fuel working on a factory flex fuel calibration. My go-to is a 2005 flex fuel avalanche. Do a write entire and change system options to function with cable throttle.
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Old 04-21-2017, 02:49 AM
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Hi,
I have a (basic) question:
Now I have done this modification to my 2000 Chevy Suburban I want to check the alcohol content reading, I haven't got any tuning software (I had someone else flash the PCM) and with my standard scan software (Dashcommand/ScanXL) I can't seem to read the PID for this.
Can anyone recommend a free obd2 tool that would read this PID off my modified PCM?
Thanks for the help :-)
S.
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Old 04-21-2017, 10:27 AM
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Originally Posted by saabman View Post
Hi,
I have a (basic) question:
Now I have done this modification to my 2000 Chevy Suburban I want to check the alcohol content reading, I haven't got any tuning software (I had someone else flash the PCM) and with my standard scan software (Dashcommand/ScanXL) I can't seem to read the PID for this.
Can anyone recommend a free obd2 tool that would read this PID off my modified PCM?
Thanks for the help :-)
S.
Only way I've been able to read it is hptuners. But you can see commanded AFR with other obd2 devices which if you do the math can give you and idea of alcohol percentage
Use this pic just to get an idea, not sure if it's exactly accurate


Last edited by i420tom; 04-21-2017 at 10:53 AM.
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Old 04-21-2017, 10:49 AM
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Originally Posted by subeone View Post
Install p59, have tuner set it up, youre done

No harness modifications needed
Thats awesome. Didnt know it can all be changed in the tuning.
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Old 05-02-2017, 08:23 AM
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Originally Posted by i420tom View Post
Only way I've been able to read it is hptuners. But you can see commanded AFR with other obd2 devices which if you do the math can give you and idea of alcohol percentage
Use this pic just to get an idea, not sure if it's exactly accurate

Thanks for that info! Will try and monitor this

On another note since my installation I am getting some random P0172 and p0175 codes have any of you experienced this kind of issue directly after the swap? I have the Fuel Composition Sensor in my setup as mentioned in the initial thread... I am however wondering weather I might be facing some other issus with O2 sensors as before my truck went Flex Fuel I had P0420 which has gone now and that was low cat inefficiency bank 1 code... IRC...

Any thoughts on this would be great
Thanks!!!
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